There is no need to take medication to prevent tuberculosis, and the main way to prevent tuberculosis is to administer the BCG vaccine. Tuberculosis is caused by infection with Mycobacterium tuberculosis, which is preventable and controllable, and the incidence of the disease can be reduced by controlling the source of infection in a timely manner, cutting off the means of transmission, and protecting susceptible groups. Tuberculosis is contagious, and the main source of infection is tuberculosis patients with bacteria in their sputum. When a person with TB coughs, sneezes or speaks loudly, it can cause droplet transmission. Secondly, TB may also be spread through the digestive tract or through the skin, which is less common. BCG is a vaccine used to prevent tuberculosis, and its effectiveness in preventing TB varies greatly among different populations. Patients with symptoms of suspected tuberculosis, or short-term contact with a patient with active tuberculosis, are advised to go to a hospital specializing in tuberculosis, a tuberculosis control clinic, an infectious diseases clinic, or a respiratory medicine department for examination.